import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

/**
 * @Author 12629
 * @Description：
 */
public class Test {


    public static void main(String[] args) {
        MySingleList mySingleList = new MySingleList();
        mySingleList1.createList();
        mySingleList1.display();
        System.out.println(mySingleList.size());
        System.out.println(mySingleList.contains(123));





  }